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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89fc6cb3704681c81073f3032cd5b3a0dc6e8a38af2f6fabf763255d0547155' 
  AND token = 'rc5WF4Z7Zh3jEXLbMgkpjtN8tNGFTkBUhKZR/DMpZcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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