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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb72bbe5d957a8d6502ece83c7dc66d89e13a04b723e487096f03445d68ddb3' 
  AND token = 'CWjaIlEtUcEsaR/OyvLHSfHCLdkIQSSz0CblS2tt0g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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