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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c781b13a8372061b5d71c83df4342df75cb85423c3f33c6137eebd7f18b28de' 
  AND token = 'GO/EapqaPEOJQDHCmHafSWQva1JLFSRTonrl0poN+Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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