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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c3dc50eb35e63e1cd0b3adadfbc211715e64c6bb5cd4b4f28ec8f1d621f594b' 
  AND token = 'VVqo5pyxXMD6OTjy18Mnu2Acle4fD2FKgBkZuScX1cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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