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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70eff22d270d41f9edb4eeec144fe57d32c95ef15812835ede5798e1110652f0' 
  AND token = '+avkUTHHxupL1nliWHFv+ZHkMV4R5eiQ1ybtXN+p/OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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