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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e2762a4b90d5e86ceea4049dd288aa97e2ff6ee8ec4223fc2c7f8ff508a7ef' 
  AND token = 'nC67ST3g+s7P97wBHp2meGpAcPAOoV1JqThd+QqHg4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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