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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b16424a2f3f6804cc12f817e06b2037318701365be60ab4032e1137160fc09' 
  AND token = 'yVjNhNuCwe0J87EW7vuB277MR0cNrSNnm5L78G+gSNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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