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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bba91dab16d416ed41c773c77a354d9cb83da84d4628e866d414bdf28eb946' 
  AND token = 'm18/tYUhGK671rFOpgYSeWvxuKDhd6TYS8KwWAeygnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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