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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ede8a7facc377a25bf5000fdc0898d5479dc27b4926b68764d355323822da8b' 
  AND token = 'H/SdGb98saJYKAjqIQ/6j1y7i7IR2iS13M4jkugpuZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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