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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e87abe71b95f74fb902610cb99d81a1e902a4499198b1739b8ea14b18f223bd' 
  AND token = 'YCFh93QpLxnoALbomOrZEFmDsBK3KeYNSLsGAVQwFMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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