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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e205d7f1bc8934f3e52dec9dc38883df56a552779222c5475fbc122b43d8ddf' 
  AND token = 'uImPlh4lYfL0wJqU/q29Y989JeC4wtQwmxr1BXPROSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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