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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36fcd44b46e5a584a082b3788e1a41d086fe91109559addaf27839bd91887c9a' 
  AND token = 'u5U2JSy89NIcN2r2KwG4cQjTidvKut/uQ7SzXNV5+CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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