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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a0582c8f8daa1ebaec03fef762d030f51524908b2866966655e4539b69130b' 
  AND token = 'aBVnFjk6E4fYrbEpXle7FMffM6V91BDrshDzL56Tp1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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