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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ea3b49a26370ce50f5f8ec4796e67f086f9810891bfd71e088d24f3ddfabc9' 
  AND token = '1j9vpgrVkSh2l4D69IVXXeTrjK/4ltNnXBU1d0dVv68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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