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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab1aee14e691e92d81cbd31e623da02d5327ae523cf3b4e960087e5f4c45232' 
  AND token = 'OzZ0A0M9U4LDW2ZE0v9d2f188dz/snVxyLxi7IfYOOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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