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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee7feb6ceafd41915a0786b5027d864072a59ebcff5c2955d44c62ea50027f9' 
  AND token = 'Vk4G5SUMIwd4/saAABivvU4IVYMmMt8+E3n8aMqlqX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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