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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31e5216524c9bb1beca3e687ddc288ef7a1b45b18c8ab24f9128efaee469217' 
  AND token = 'VM2iBOWDqSNwaFDknspIyIZO3SuBe9GE8VlkZMucn+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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