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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88acbddd4603a938068a6f56555a1aaa2c32240273cefb774f87380126e87a9' 
  AND token = 'zZUrpGrZYemQia1/VgytCGI8cNF0Ag1nHXJcxd/5Ifw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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