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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196d7aba24f2cd00bd662bd21f16482c0a607c5b53480a763ec28093fa6d4afc' 
  AND token = 'fFJsQmXfI6sdoaiOPUumTkqwFLSLfGLpQzHfovIxOwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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