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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eea8302a567db582538ad6edd6bbe4fe8602dc487bf7a1e17548af9e7239137' 
  AND token = 'UaoFcgmrxpXzS0q72eDeOgrteDNcGsOEZXEabn/VGkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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