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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e2f4d2b942b298807f0add16277536f50bb3dec99946843b0c99bc0416776a8' 
  AND token = '+p2CFlBdW0nhOi55aDQap1VECzXhLIOJh7h9s2r+6Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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