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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6a5598de01ee572007d7c6d2175d4e684ff11c09f4c70cce4b285fdcbb80d7' 
  AND token = 'W/hkdxgLrEzTfs/phPCXRRS9pSeN5yRXNF4OWl14HQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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