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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7859cef90e0963ebf4b7780a5317b97640c1a90cc62eccd8c20127db5db90c46' 
  AND token = 'Ojr4Sld3IReOLs+kPkv0zpC7iw4RGihM4txQNwgurp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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