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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61511fafcd6e1b326e7abe0adf68fb77ed7c6b99dcfe5de310e0ec45763381bf' 
  AND token = 'iRz4L9wR8oN6w61ib58GVAUKlTJt3DgGlkOR5ByAhqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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