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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8414c654d4cb05ba7d80e9f3748dee0a2801fb56ee226d1e8e8cd184057c5a64' 
  AND token = '96lFGO8m9MvEYCuAoWISK8eE3uvO4mlODqwA5XoBi8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00123

JSON explain

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