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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d155cf445c0ca9ed16b3516793528585357a63535f18b580b3f14a99e568637' 
  AND token = '/x3j/VXCYbXA/S/jf5adBFNlrfflvDbXvlTPHRE/bH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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