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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d096b7b318a95c3e7534c730a5dc817e391f9d815cdeaab1f143c95390ef97' 
  AND token = '2/pVXFAIbGWSUz5kcxoH39VtU1jLVYDkx4JiRrjj2mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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