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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89c1c0ec27567c10e58343bc790e9acf88e8864735372c3135df50aa375e590' 
  AND token = 'I5frbjVsGaNNwCUP6IFE984zmGCTx5EQ/uAscZyvMRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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