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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df4958eadbae82d7eea81b24fb8ff7dc17c1db253aeadcb0aed1258923bf56f' 
  AND token = 'StxY0mDVggj4JcnJtcWYAdP3V5KJAIx1yPGDLLF4IxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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