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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50a2adc5a2c299484c01bd158a3a452c669b3a707d36c676ad074fac39f444f2' 
  AND token = 'X4u1oILqhDR4N0TehGtrH9Tu9vTIEPBe/UX58fCLJtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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