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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a6c05c23d7d0acb2d16c1d993e24cf891c4080d1db23f8f3f068ef96e5dc52' 
  AND token = 'a4nQSjO/tExCGLSB94J2xhXriSMeyjCWfYJid3gN/Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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