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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4abe418b3270aea4d86ce149c71b25ac613934a2790f00cd19d1fb81d6110089' 
  AND token = 'LVdJoOdTlZHFjzBJk+b+oZ1E0imQJ5x8REA/VbUjT68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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