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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f01f6fca859ad7a4d0de9939f9ada52114a9adb1d89ca62b6724f43f93ce4e' 
  AND token = 'pI4/U8N5wU3prEbUajGU/HyX1SAWJuEUwvsuiu60Q+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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