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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f201f443eec9c3a0c01920ab1b52a994736c8a2b3dc3d10e3890def4479df7c7' 
  AND token = '9kwtyspTEbhDQXr6kzQ18BS5hGJaeJ9nRbzrrdu9O3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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