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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff9e90e05bb7f0a4d7de9b2617415d937124a3aa827a3225acbf298487125b4' 
  AND token = 'i1IUgAwXgTFvECHL9pxi8/c82VBX5jM7sCPOyJYfA1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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