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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7537803e5ef02181dea293c7a5f94de9e847c85655f1243f465e0a8ffacb8c' 
  AND token = '0BD6iuAclp+EwhJIXK8T+5AelIXiiEWOReJHrGLB420=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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