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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f418bf6da858c839f7a1444426b8fe55d0b7a4f8f32ab2d179d697735aab647b' 
  AND token = '8/0xp8PDUW66LHelSbeWpsLY5OB0N/t4YecgqYIjoUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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