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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9516123666b55bcebdfd1174d3218d02a2cd006b3d16cc4e892aff19625ff7' 
  AND token = 'nAcb6LBOf4/0Arwn+GhZm4MOi0YNes7pInYZrbZVWLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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