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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43ec68919368dee3aa1cdea3d0b19620dacfe4c61e9307cf3559e1c6b9d90d88' 
  AND token = 'Z0yEkclah0pNPjiImZPv//MbHNb81xsB0B3Wd+I+M+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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