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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '182770a1f4c0d610b8ba34d0fbfc502c68d73df6ab9e92d9c68519bd1cb3be2c' 
  AND token = 'R1UI0istfv2lOFsTpOhdW0Hy178euGUIUo1idh18Gr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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