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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf4073eb997f6460faee7a0d3c50e79d803914e79052e24110d4327d7e80237' 
  AND token = 'zzg2KB4hE2gjIlhcV34ENGCD2vvIqlKLiGJvMf4fKdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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