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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75efafd41aacb8fe8b0caba54e4eda460050fae107d4f07f5feb5eac0195304' 
  AND token = 'VluBP9NqEybUInKoUawd3O5Lkqd6C/atyLdynWW742w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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