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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9869f22e0169d3435370e57a50c4ce576030e15399128dfde0334ff32d44c3' 
  AND token = 'TXrehkwycF2+OFg2U6rnGiSLPp0xE3dws0XsyQ8uxXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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