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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a74480559f4862e4f713b7578d98373e909ffd9b460f3323b2f3a7817b4dbfa' 
  AND token = 'gza+CAFVGP1SIMPIGkqSOB17Nm1ec+QAFuB9/COXBac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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