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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eecea4bd0c2ea93c2498ae6eeb3b249bf204e8970592ed622d89899c4d81ec1' 
  AND token = 'NkdScQkXm6zcBZHAc07nId2RTM+0HQaunR0Hvptvk1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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