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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d7fc322ee84a2d330af910d2bae2b5a007835696f3e3b0756d4ecb0cd00c81' 
  AND token = 'dTqQwzi/nwJ0LMl6PDJ6ryjeL6C6FMGzngzSE35eFGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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