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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988ab2f5e39b38ec76a73d49cfce75317ef696aad71dd65894aac1cf45f42cdf' 
  AND token = '5athawoB50AYHUlbrVcdO5mA6y0LIHhKGqPIPE9+epY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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