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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83d55665574247024491749c7f837ad57c1a54ad6eda77786ea179a4b033d59' 
  AND token = 'HBVeJvSpISv/2YvZo2ZbKvnBROMec6gZivF/AnBOoEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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