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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1e679915efedb8db27443b0d3cbac1bf46aa5f3493f931364a38422cb3c10a5' 
  AND token = 'LS2PGfNxaSNI3Zvk1B74CTVUuAlLF3ZLcgoLxbFAJ7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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