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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be9d793aa89f69171b6a80542f3e61af58151a2a534174fbe8c421ba9e813e9' 
  AND token = 'a+94ImCQZ7w2KeTxiGGYbpvGHzeHifHy1u77i+6q8yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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