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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32343d9aeebfd01c14dec9fd91e9cf9224e3ca9c4dff63fd4428de3130ad4bd6' 
  AND token = 'Vb85p4nfhpSS1K87DsxFiT90j9R+of5Utw3J+2E/DaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}