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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38df578667d403e1a0f74c51eb3370068014f52747770ad0aad70b04440ebd23' 
  AND token = 'xVYPfV5++C62tsdd05nnT8J0nyHaSlplLM2ZibBDN3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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