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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '730f1bb095e8d5347b9d1d2f72884ea5928ab0b45c9691f2431187d20c382169' 
  AND token = 'm6Ier5lWf+6vbFrEgZ9ynQb/t+M2HH/fxB7x2gEUXB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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