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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5aa0dfa333048e82654cf7d78157361bde529d88cf3bc4dd3e8ea429dde5ce' 
  AND token = 'hOY63MVyH0uCwVBd98lj4fd4dwk63tNzbzzQ+ho2578=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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