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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e4e4f90994759e7c6967b906f14283e855a0a0efa770371821428312506205d' 
  AND token = 'ubzJ2ff6p3Ss2HBrm0W3AQqVvveACwuYJR6hO5Aht4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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