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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b12edeb40dd73a86b313ca291489e18528be26c64c5f0f7aaead5bdc361af0f' 
  AND token = '1d9PzBFmTnfv8Vf7a4/PQ+OgkKzryecRJmkrJabDJ1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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