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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935c70bab281af0275715a5cd58d7866936c42f15d3242a792c45ab73d900dfa' 
  AND token = 'z3USk1POyj6CJnZzRFklSMt0ZWhUsNzD54eDQY+772I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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